Live Reload has a deadlock in v2

[kentquirk]

The reload code in v2 has a deadlock -- inside monitor(), there's a lock around the reload, but the lock also encloses the callbacks. This requires access to config values that are now write-locked. This wasn't detected in testing because we didn't set up callbacks in testing.

			f.mux.Lock()
			f.mainConfig = cfg.mainConfig
			f.mainHash = cfg.mainHash
			f.rulesConfig = cfg.rulesConfig
			f.rulesHash = cfg.rulesHash
			for _, cb := range f.callbacks {
				cb()
			}
			f.mux.Unlock() 

The Unlock() needs to move up above the callbacks.